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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e046eb59d0e19d2a2be91185767db1e312ead2a31290c65e4ed19ba861fa6941' 
  AND token = 'CK7AFfSf4KEPh26ESv/Z0zIo0X4o64hc7Vdx+SAAxis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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