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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd0c031f6f0a0635f602d2e14b45221efce84bac0f00b43be08c4db8717737f' 
  AND token = 'Cm8TnWOKMd0E93L48cFs5J4RzIuHC4sI3sw9/UlWSwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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