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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01ef5f80080ce0962208a8ecb663d9503abb0517e174f5c5deec86fb25e3d84' 
  AND token = 'szywMgsRMhaaLdnBdklmk6v+N9aAj6g0q2lDLJEhsC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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