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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772a7fc7a194b90c145fd7a6b015fbb90f28fcd4f00544a4e0b7d1a2ae7e9225' 
  AND token = 'RBOZLB8jRu0AcsKcxkH7v2XB30I5558ISIz3HmAFMeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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