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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a0f878401b21b0c6727808f8617fcd5b4b78694bac8f4f90b1d3970a4f0ea2' 
  AND token = 'NoATTGFjWv+A8C6n8nBkpVpI/Dabd8b0yZGX1NPYihQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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