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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d57324e2ae66e2a8cdd63419fa0dd13487f9559d3f496885a01477b27ce85be' 
  AND token = 'o+6Elx752HUTyY4qXXV8R287/N/L9haRhHIdZqMZJ04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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