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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf2ccc72179c9dec7045eb9cb9baf5c1c1be7ac55ed3b38d15bc0762d15a530' 
  AND token = '0c/dxgAw37dxFOQgDlevy2R6KPH6RADFE0Dn8KHFycU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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