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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b889ec2882ac9464c41775f08343336aa33799892147f95682d51fe4133849e' 
  AND token = 'hCgS/ppHDPD+1sCuA4g7IWXujHRaWW6mWckhate6p90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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