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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb5ee50320d7627fc0fa0173c1ae10bc0d9166e02a1d75ef1513100a8b6ef509' 
  AND token = '9XuiyBg2e4egKnH4SLEafQO5rdPRFs1k06EasCVfYkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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