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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d5231cb5f1e7104c25625cc5a9882570536b7ab716cfee9eb8daf5a7ef52f8' 
  AND token = 'A09DdHxP6VI3EVwlBpGzwjjfrbTYn9P4iu58jPH8wog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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