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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '260fcafc0c3a120d81b989bacab3aa281fa54a2c1a7eac400c5b0c236c4e02da' 
  AND token = 'CDEfv8AkM+uUU0htsgb64dBieeM4tHoyPoI0fnNSx0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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