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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3bd2e0ac06f9d5363366e3514c1be675cf4dbd8f9783f3b10d21f55a7cfb1d' 
  AND token = 'Y8ewJ9+QecVqLrD2y2oUhk7hAk6R2d9g4xyvA3BItlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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