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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3dc895c711de8307838d9f5c2cde53d9b9b81deafcd0abb6374fa11cc28be8' 
  AND token = 'E0cMFdcNC4UTKbp5NCqSQ+kv6THmcBMY6oLwZ+Oqy3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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