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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a59dc4792b6d0b67a7a7e2a4685404510c929c4573bca46afe8e6a0d18ce12' 
  AND token = 'bHdzq6saQK/ZYuHWkdull+IfUQ63SFv1F7ec+Ff2P8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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