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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e834e9f11174c0cb6eb359f348588d9c4a6dc5456db45da99cba58f7071101' 
  AND token = 'EDtskb638MLoc5mhPT51lm1602qQ2R4h208FVR5ppCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}