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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f4b2ec06a42dfeee0ba0d8ddd4c797657b58b6943a017adb8bdac511971998' 
  AND token = 'aROXUep36yesP4PfXGsLdXMH2lgYplr73qzD50Pjn+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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