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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25630360b5194d520e6237e4787819942f1330f7482cfc26feab2fb83439170c' 
  AND token = 'h7oWj1GRO7rc9++QPWk18hcTh/EGdYOm90ZNUS83n4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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