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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b69e47e6afd31d9a036b99798454ddbb530b9f41ddcc3fb1c004071f5981c5' 
  AND token = 'uGopVp6Z9UwVFBJAWeM+7tT40i1QlUJ955DJwWYhUaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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