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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd0f8f0c307b75885fdff26b011e6a5d9ad0afba92c50ecad5c8e6874a9940b' 
  AND token = 'Tk7m3MKN1pQqd4eTQWLN1OAsQQ+4GFHbl7uVAaAIyy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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