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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f230d6716337f945566669a543c2bf7e3ae1059d98473c3f478710064897f53' 
  AND token = 'R4yZDyUPwEsuZqTR91fSLx8l2nwd07cpX4P91QB9Ga4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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