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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f420cfd456e919a9316ff59a9cd2d0003ae6875e550b6d9a58a8a1f7246bc28e' 
  AND token = 'G5kND01KIx0keCJs6nbuTjYxRGcy8SQ8x9UOON572LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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