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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d6cb9c57a21ca28a1a1a26a264bb8a4a2ac2b909640c8e3a0cf6f2e5137532' 
  AND token = 'WrXGAUUOV/Teb/v3RYP5ltfvk70+ZExIh7N8XKi1irQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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