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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35cac0bc0c47e2d96b4f26e091ccd2bc2f8ee4c50a8582134c994549cfa6b1ee' 
  AND token = 'HwDYxFOZHjoqBLEHKgw6zEOHCBplcq9tcWKqofA4Aig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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