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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0fb2ff2786883c51f92ae6b42d22ad8f7566ac471ef19759c7bb1ff8fad31e6' 
  AND token = 'IedX0jw/+7Ub8ilN8NJAITRXoW5Y+/eq6G1s3YQlm38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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