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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc68af4199dbcce003cd3f238a6ede7ae81688e82d8324199bc1c3e8097525a' 
  AND token = 'uqFQqpfOhOI/L4VAm48Sv/CQw0ky6x86T4f2YskozxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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