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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0558ce95b62c949de09ee05886426c65a9058c47a716ccf4a0a403baae3664d0' 
  AND token = '0wwmUyuzI6L+fLLavYJ2JuYE8WI0m4HACOqxPKm4cS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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