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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4525bfb47881e49e3249df6d22ab3e6714c51827c07dab4aa92490ffc5734da9' 
  AND token = 'ldE+nbWH+F/dfCNJKleLce4vJ+2VP9C+Jfnxq3e4/GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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