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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7355b8238372d94dc6822a113b58b97ac605c7b7d78ea25a1583928b75f9652' 
  AND token = '3VQrCfRDv7obNXsSq/kZZkbzoNyr0VdVYH2WmjR7o5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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