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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b15f2a92e5076401f30c9b97f94892af11a30707c95b7804e050048e4952c8c0' 
  AND token = 'fEYop4lmBtqL3FpdkSxTl8C7+wJKW1wLopDRIHs9j4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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