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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e52319cbda7f3b91048d2b7905c7b6d0bcaa1813b4f90942e6cb475e6ecde3c5' 
  AND token = 'TcRlVb5q+s0JFPWorWyqr2dYZsUEPdEz+n/Qa3wCFCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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