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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46629c487bf70c96f7bfd5a0a0af02f0688ae64e633f7142b581c559684ea46' 
  AND token = 'f7eo+k/p8IXIIjYjk4+tdNTZjreG1Uwa09Hzh3v9470=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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