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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f8ff2623b70fec3700b6811bc4ab0c194770c43798ff311a522403799f7f9a' 
  AND token = 'b+e4G/nxZkEFj6f7iqDkyu59Eg4xZxYwV4rLLD2Q3eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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