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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1dd1446a7991f0a9c424ebf8a0265661cfeaa37ee5e62ac21410f42c054ea1c' 
  AND token = '8E0B+4RAuD5BilANo34SYsIUJeK66w54DPT3tPj1m/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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