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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e02c57e0b0715d639f8c6d55c2da5c4409cd329ff4c5119b8e66e3a59c2497' 
  AND token = 'j4R+sAn1SQcsZvWVNedG6TvSghX2U/HIq1RW11T/W40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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