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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67d6907d5349e120877cb17a6ccd4353fbce31002d2262c7209882560680c04' 
  AND token = '+/ZX0tbpJP+iMbUsPQ8oVyPWuMmy1EtHqE6ZGv/b+l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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