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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3772b4e5f6a9602c26e13b8f29ae4ba7cf4459d4d77d8912bf9cf6543524548' 
  AND token = '0Ewlw//vEjAoaNbV8aVXmsHttvFTXBVsHopUhibpTfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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