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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a299408504639c5dfe26f25ac6e4171b526adbf0f42b70ba3a9a03bf9e3791b' 
  AND token = 'jzXFN8makwTHEqsTwdOf0II7s/55/Z6cr2xyQcWxNGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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