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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd8a6e932b5ce032deb1c1c1a18724cd01f6ed5b84140df2cf1aee6b765a1d4' 
  AND token = 'm7Uer1QmI8uGQDvXt8u8w+hRF70rVSv134+ol8QEP1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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