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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a104604a60dd0714b241f37b9f37be0e4d584b8f9a3f41c7e56538b37d2bcc3a' 
  AND token = '+OaN+cng3+xQfjRcSSi+w2dAuxJxujW/7YYwNFCejtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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