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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89a2dca8c8a2ef4c45c2d5867a9c533d7443043a5c9584d21530965d322042c' 
  AND token = 'T+eEUjTFlomg9sQIjeWA2+JuLKIRsR8vZU9yfjiIkgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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