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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9c4d7cce19568c3b3c42a2f47332444e5141c2ffd7c95068c14d3ad12e7ada' 
  AND token = 'L+2ydSFfJT/XYxloNExcF9F3LaiDTOImtVSCxwj/dEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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