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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc31fe617a1a8746fd646cd0702ff28a4ecc93be98f987be1ff606fa8330b1ca' 
  AND token = 'vrW21cniAb630D+t80OshRnM7gNUBNRD5jPV3Vr8490=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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