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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18259d6d6c138145a824616de8bd601ae9e0b2419f57acc64f1c350c97f2311a' 
  AND token = 'vh3nFPVNorm7zaZFyOa6a9PDYwzU5NrDMHxJ41TOX6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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