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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada2a656f0fefe6f48267a765ef0a495331526975c7ca6279d4779994fc6d2d4' 
  AND token = '4gbu0uOEtPvehXZVzt90c0aR495XjbHn7IdPQuZQg1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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