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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5dbbc69bb1a2d0475437d4fc432e5a1706a3ffaa96a940eb65a5d03ad09f979' 
  AND token = 'pLl/he8g/1wRul8Tu12SaGN0UvzKQJuEctwyDl7keyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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