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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc496d0d27c7b71339ed8a033857b0f47cf0c6b5437b63d6907db7f64cc6b1b4' 
  AND token = '7SgM8heP5sGxlz+Bv7+zT7cXP5v9E7AagWTrnX8fjCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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