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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e41c953ed4ab99fe4a758d25438458931bf65aa11d8821cac901aa6ede379d55' 
  AND token = 'rENz8d85kNgQm+oSD9Zf7IgIfajEyZA3DfejAvCzMU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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