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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11839cbb1978f6c0cd8e090a8fdd45db6001babc3fb8e8b0b8f0b8f1468409d4' 
  AND token = 'Q58kVESSNF8GyBkHkrsZ9IiepBsMjmctFY5UN50HmeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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