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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50dd9ec33a809b2a49f1b75bc30690a18e908cb2f0a524b50f786b4493319b34' 
  AND token = 'jfYyQhS35GHXZmNrKFOE09zPQSFcHRHbXjUu73EMNrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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