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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b698feae5b5db9fdf5dd31a3e7e49ccd8bafc0abe89d1ad1f824417dfede41f9' 
  AND token = '4e79z/liWn7WWG2RnHwkydmwI/wY1+xlgqqK56HdqCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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