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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f806dbb0daf5c32f514b33d96aca6fd6e04801f858504a8c6b2cb8a8ff5672' 
  AND token = 'v3wFl7zCeISQY4VbzVHjNNCLwZRHILY1679Xwr4zdow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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