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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970353b0781ce976d88bb7759c2eca305376bcde7ee57101b6e008d4af3c425b' 
  AND token = 'BrSP+ht+0UnEBH5F+wbKn8Tod6hvdmKq9tBN8D/S+/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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