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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b06458fafdc644370422c3157aa2faaff6a2ba3f82f73abc6aaa35fee5d63c' 
  AND token = 'u2oExmfnsJS6eTVsc2k2d5adoQqyXv2jAFZRGzGa31Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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