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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38228b157d6e0760a014dc341b82309493e0db41503f198e4a12fed2b3c60b76' 
  AND token = 'UnZ7TCBIja2dPsjk0iAfJvPslTjnAHeg6PRCyGImFfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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