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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f69ae735ca2811ab9f45a23cefcedb7b4b294891cdd38b6ec433317c3f9c2b' 
  AND token = 'ihWEAQtHVHip1JbadtW044yNxSAy1cMTG5T3hxGSRdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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