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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc95745ccc4b501079e48e841d44d9d7d5e7d67f0ff43c07d67efcfa88f6e0b' 
  AND token = 'Xf8yM3Sm7YRbXUmbsjYIgLyDnUEMOJblzLRh/2rjFqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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