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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213dcc965a49663c2cc53dc7656fe3b764430d3d2db9fa4d0bfb20b1472c1d72' 
  AND token = 'qFMhh4C3qHmmI8A19o92m5BNhibZ0A5jg8L5kk/staU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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