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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e6c6fdb1d7d792962f32092fddb182b8a547c5bf5bc615389df89f487d4895' 
  AND token = 'cZ2pOGpXeTX2HCJJMtIvqNenpaPLNSJbU6sNRDUTr8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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